console: Add simplified 'serdev' framework from Linux kernel ...

Port 'serdev' UART-slave deivce framework found in recent Linux
kernels (post 4.13) in order to be able to port 'serdev' slave drivers
from Linux.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

console: Introduce console_drain() ...

Generalize high baud rate UART polling code found in lib/xmodem.c and
expose it as a generic function in console API.

The usecase for this -- besides X/Y-mode data transfers where the code
originated -- is command/reply type of serial exchages at high baud
rates (~1Mbaud) with payloads exceeding inernal UART FIFOs in
size. Such interactions are not uncommon in serdev device and this
patch is done in preparation for serdev support code that will follow.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

rename file_operations -> cdev_operations ...

Linux also has struct file_operations which are something different.
Rename our file_operations to cdev_operations which better matches
what we have.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

console: move global.allow_color handling to C code ...

We have global.allow_color, but this is limited to the environment
only. Move creation and handling of this variable to C code so that
we can add support for colored output to commands/console controlled
by the same variable.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

console: Use dev_add_param_string ...

dev_add_param_string allows to pass a priv * so that the device_d *
argument is not needed and can be removed later.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

console: expose consoles in devfs ...

This enables displaying text on e.g. a framebuffer console by issueing

	echo -o /dev/fbconsole0 abc123

Signed-off-by: Bastian Stender <bst@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

console: replace set_active by open/close ...

Opening and closing consoles should be independent from setting them
active. This way it is possible to open e.g. a framebuffer console and
display text on it without showing stdout/stderr.

Signed-off-by: Bastian Stender <bst@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

login: rework login mechanism ...

We used to have the login functionality in the /env/bin/init script.
This is hard to review and it's too easy to break the login functionality
with changes to this script. Move the places to ask for a password to
C code where we have only a few places where we have to ask for a password.
Mainly these are run_shell() and the menutree command.

This patch introduces a login() function which will only return if the correct
password has been entered. Following calls will return immediately without
asking for a password again.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

PBL: console: Make independent of DEBUG_LL ...

With more stuff being done in PBL regular console support gets more and more
useful. This makes the PBL console independent of DEBUG_LL which is only
meant for early debugging but not regular output.
To use the regular PBL console a board must call pbl_set_putc() which stores
a pointer to the putc function to be used.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

console: Add console_get_by_name ...

Commands like loadx/loady wish to find a console device by its name. Add
a function for this.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

console: Add functions to get/set baudrate ...

So C code can call a function rather than fiddling with device parameters.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

console: Add functions to get/set active state of console ...

Currently code needs to fiddle with the active parameter of a console
device directly to enable/disable consoles. Add console_set_active()
to set the status and console_get_active() to get the current status.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

console: allow to specify the device id ...

so we can use dynamic number id with specific devname

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

console: Add set_active callback ...

The netconsole needs to be able to deny activation when the network
has not been enabled. Add an optional callback to the console for
this.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'for-next/efi' ...

Conflicts:
	.gitignore
	Makefile
	drivers/serial/Makefile

console: Allow persistent device names ...

Add a devname field to struct console_device so that the device
name can be set by the driver. This makes it possible to have
persistent device names.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

console: Add puts callback to console devices ...

Some devices may have a much more efficient way to output strings
rather than single characters. Let console devices implement a
callback for this.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

console: Set Linux console parameter automatically ...

Linux specifies the linux,stdout-path property in the /chosen node
in the devicetree. Unfortunately this is ignored in most cases.
For cases in which barebox uses this property for its own use we
translate this into a Linux boot arg with:

- the console name provided by the serial driver
- the the instance from the 'serial' alias
- the baudrate from the actual baudrate.

So with this it's for devicetee enabled boards no longer necessary
to manually assign a console= parameter. Should a user not want
to use the automatically assigned parameter it should do:

global.linux.bootargs.console=

in the environment.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'for-next/rs485' ...

Conflicts:
	common/console_common.c

Merge branch 'for-next/login' ...

Conflicts:
	include/console.h

console: factorise function to get the first enabled console ...

rename it to console_get_first_active

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

introduce runtime loglevel ...

With this the verbosity of barebox can be controlled during runtime
using the 'loglevel' globalvar.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

console: introduce new callback set_mode ...

so we can set the port in rs485 mode

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

console: introduce console_get_by_dev ...

so we can get console by it's device

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

console: drop f_caps and check the function pointer getc/putc instead ...

None of the driver make the difference between STDOUT and STDERR.
So we just need to check if putc or getc are filled in the console_device

save 32 bytes on versatilepb

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

login: disable input console if password wrong ...

so we guarantee that barebox is secured again user interaction

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

console: Use dev_add_param_int for baudrate parameter ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Treewide: remove address of the Free Software Foundation ...

The FSF address has changed in the past. Instead of updating it
each time the address changes, just drop it completely treewide.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

console: remove unused function prototypes ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

console: add console unregistering ...

Some console are transient, like the USB connected serial
console which should be removed when the USB connection is
severed.

Enable console removal for such devices.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>